Yes, "conjuring" is a gerund in the sentence. Gerunds are verbs that function as nouns and end in -ing. In this case, "conjuring" is the subject of the sentence.
The Conjuring (2013) is rated R.
The Conjuring (2013) is rated R.
The Conjuring is a horror movie.
The Conjuring (2013) is rated R.
Conjuring - book - was created in 1992.
The Conjuring was released on 07/19/2013.
The Production Budget for The Conjuring was $20,000,000.
Conjuring - book - has 336 pages.
The Conjuring grossed $318,000,141 worldwide.
The Conjuring grossed $137,400,141 in the domestic market.
Gordon Hill has written: 'Card and conjuring tricks' -- subject(s): Conjuring